Barrel safety means for fuses



July 25, 1939. H. JUNGHANS 2,157,302

BARREL SAFETY MEANS FOR FUSES Filed March 4, 1957 32216123011'[L7/827710 @W5/ans A ZLZLo/wey Patented July 25, 19,39

Helmut Junghans, Schramberg- Sulgen,

` Germany Application March 4,

1937, Serial No. 129,106

In Germany March 4, 1936 l Claims.

This invention relates to a barrel safety means for fuses, and has forits object to utilise for the safety device the force of acceleration ofthe projectile.

According to the invention, the barrel safety device residessubstantially in the fact that an element, which secures the firing pinin indirect fashion, is moved by the action of the force of accelerationinto a position, only in which a releasing action of the said element isable to take place. In this connection the arrangement is preferablyVsuch that under the action of the force of acceleration the saidelement lags behind in relation to the movement of the projectile, andis not advanced to initiate the releasing action until the force ofacceleration has ceased. Preferably, the said element is constructed asa spring-pressed bolt, which co-operates with a slide member blockingthe path of the firing pin in the secured position.

In accordance with an additional feature of the invention the boltpossesses a disc, which is mounted in sliding fashion and rests in acorresponding recess in the slide. This disc rests on a fixed basefwhilein the other direction it is free, so that upon the movement of the bolttowards the rear under the force of acceleration it remains in theslide, but upon the forward movement of the bolt is also caused to beadvanced. The slide member thus released is then able to move under theaction of centrifugal or spring force out of the path of the ring pin.

An arrangement of this kind has the advantage that the element securingthe flring pin in indirect fashion is itself secured, not by anotherpart but by reason of its position, from which the same can only bemoved by the force of acceleration.

A possible. embodiment of the invention is illustrated in theaccompanying drawing.

Figs. 1 and 2 are cross-sections through the device according to theinvention, Fig. 1 in the stationary and secured position of the partsand Fig. 2 in the position in which the parts in which they are actedupon by the force of acceleration.

Fig. 3 is a plan view of the device according to Fig. 1,

Fig. 4 showing the position of the parts after the release of the safetydevice, and

Fig. 5 being a plan view of Fig. 4.

Prior to the firing `of the projectile the firing pin is secured by the`slide b by the fact that the path of movement of the firing pin isblocked by a part of the slide. Through an opening b3, b1

in the slide b there projects a bolt d acted upon by a spring e whichpresses the bolt in the direction of movement of the projectile againsta Vstop which is preferably constitutedby the plate g bearing the slide.On the bolt there is mounted a disc or ring c which is held resilientlyso as to be shiftable thereon. This ring rests in a suitable recess blin the slide b, whereby the slide is held against the action of a springf in the position in which the firing pin is secured. The slide is alsofurnished with two openings, one for the passage of the-ring pin andtheother to,A receive the safety bolt d when the slide is movedv into theposition of release.

The operation of the device according to the invention is asfollows: l

In the position of rest the slide b is secured against displacement bymeans of the resilient ring c mounted on the bolt d, such displacementalso being unable to occur upon initiation of `the rotation. lUpon theilrlng of the projectile, so long as the projectile is still within thebarrel, or in other words so long as an accelerating force is effective,the bolt d is forced back, the spring e being compressed (Fig. 2). Thebolt d is thereby displaced in relation to the ring c, the latter,however, still remaining in the recess of the slide b and accordinglysecuring the same. When the force of acceleration ceases after theprojectile has left the barrel the bolt d again returns under the actionof the spring e into its original position and thereby presses the ringc out of the slideb, the ring c not being supported in the forwarddirection. The slide member is thus released, and under the action ofthe centrifugal force or of the spring f itis able to move sidewards toallow the firing pin to pass through an opening b2 in the slide andthrough an opening g1 in the plate g.

It will be understood that no limitation is made to the specic form ofembodiment shown, and that numerous modifications are quite possiblewithin the meaning of the above description and the annexed claimswithout departing from the spirit of the invention.

Having now particularly described and ascertained the nature of my saidinvention, and in what manner the same is to be performed, I declarethat what I claim is:

1. In a fuse for projectiles having a firing pin, a safety mechanismcomprising a slide mounted in a plane generally at a right angle to saidring pin so that in one position it will intercept movement of the iringpin to ring position, a spring mounted to force said slide intonon-intercepting position, a bolt mounted for movement parallel to thedirection of the axis of the projectile, a device frictionallysrippiilsqsaid bolt adjacent one end thereof and normally positionedthereon to-block movement of said slide to its non-intercepting positionand thereby prevent operation of said firing pin, and spring meansacting on said bolt adjacent the other end thereof in a manner to holdsaid bolt with the device in normal blocking position, said safetymechanism being so pro-'- portioned and arranged that nring of saidprojectile will cause setback of 4said bolt against action of the springacting thereon and slippageof said device on said bolt whereby whenacceleration of said projectile ceases said spring will force the boltforward and carry said device out of blocking engagement with said slideand permit said slide spring to move said slide to non-interceptingposition.

2. In a fuse for projectiles having a firing pin, a safety mechanismcomprising a slide mounted in a plane generally at a right angle to saidfiring pin so that in one position it will intercept movement of thefiring pin to firing position, a bolt mounted for movement parallel tothe direction of the axis of the projectile, a device frictionallygripping said bolt adjacent one end thereof and normally positionedthereon to block movement of said slide to its non-intercepting positionand thereby prevent operation of said firing pin, and

3. A barrel safety device fora fuse of projectiles having a firing pin,comprising a base member, a safety slide slidable on the member andmemos having two openings therein, a bolt slidable in the base member, alocking member .mounted slidably on the bolt and normally extending intothe slide in one of the openings to lock the slide from movement so thatthe nring pin contacts the slide and is prevented from movement. andmeans cooperating with the bolt which stores energy upon iiring of the'projectile but when the l projectile ceases to accelerate the energy inthe means forces the bolt to slide in the base member to release thelocking member so that the firing pin may penetrate through the otheropening inthe sllde.-

4. A barrel safety device for a fuse comprising a plate. a safety slideslidable on the plate, a bolt, a locking member slidably mounted withfriction on the bolt and extending into the slide to normally lock theslide from movement when the locking member is adjacent the plate, and aspring for the bolt, said locking member when the spring is energized bya backward movement of the bolt away from the slide being stationary butwhen the bolt moves in a forward direction toward the slide the membermoves with the bolt to release the slide.

5. A barrel safety device according to claim 4, in which the lockingmember is in the form of a ring on the b'olt which has a tight fitthereon so part into which the bolt fits when the slide is released onforward movement of the bolt.

7. A barrel safety device according to claim 4, in which the safetyslide is provided with an opening through which a firing pin may passafter the slide has moved upon its release by the bolt and lockingmember.

HELMUT JUNGHANS.

